221000233021 has 4 divisors (see below), whose sum is σ = 221062789692. Its totient is φ = 220937676352.

The previous prime is 221000232997. The next prime is 221000233031. The reversal of 221000233021 is 120332000122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91454227396 + 129546005625 = 302414^2 + 359925^2 .

It is a cyclic number.

It is not a de Polignac number, because 221000233021 - 2⁵ = 221000232989 is a prime.

It is a super-2 number, since 2×221000233021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221000232986 and 221000233004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000233031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31273036 + ... + 31280101.

It is an arithmetic number, because the mean of its divisors is an integer number (55265697423).

Almost surely, 2^221000233021 is an apocalyptic number.

It is an amenable number.

221000233021 is a deficient number, since it is larger than the sum of its proper divisors (62556671).

221000233021 is an equidigital number, since it uses as much as digits as its factorization.

221000233021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62556670.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 221000233021 its reverse (120332000122), we get a palindrome (341332233143).

The spelling of 221000233021 in words is "two hundred twenty-one billion, two hundred thirty-three thousand, twenty-one".